Which should I go for: Birkin 25 or Birkin 30?

I have the GP30 in blue Zanzibar and a Feu B30! The GP30 will give you a good indication of size. Between the two, I find the GP to be more relaxed and easy going. Depending on where you go it can be more under the radar than a B.
But if you have your heart set on a B and can’t get both, I would keep waiting! Don’t settle just because you can get it now.
I can do both a GP 30 and a B30 (couldn't do two Bs though, at least not in the same year !!)
I am thinking I might get the GP30 because I do like it (In general, I do like the GP; I have a GP 36 that I used constantly last summer) and I can definitely see myself using it now. I like that it is easy and carefree, I'd be using it to go to my son's baseball games, or for shopping or for just hanging out; who knows, maybe even for work. I currently use a B35, so getting the smaller GP will also let me know how well the smaller 30 size actually works for me. Plus, I like the idea of getting the GP for a pop of color but getting the B30 in a classic color.
 
I can do both a GP 30 and a B30 (couldn't do two Bs though, at least not in the same year !!)
I am thinking I might get the GP30 because I do like it (In general, I do like the GP; I have a GP 36 that I used constantly last summer) and I can definitely see myself using it now. I like that it is easy and carefree, I'd be using it to go to my son's baseball games, or for shopping or for just hanging out; who knows, maybe even for work. I currently use a B35, so getting the smaller GP will also let me know how well the smaller 30 size actually works for me. Plus, I like the idea of getting the GP for a pop of color but getting the B30 in a classic color.

I like the reasoning. Makes sense. If you don't mind me asking what is the current US price of a GP 30?
 
I can do both a GP 30 and a B30 (couldn't do two Bs though, at least not in the same year !!)
I am thinking I might get the GP30 because I do like it (In general, I do like the GP; I have a GP 36 that I used constantly last summer) and I can definitely see myself using it now. I like that it is easy and carefree, I'd be using it to go to my son's baseball games, or for shopping or for just hanging out; who knows, maybe even for work. I currently use a B35, so getting the smaller GP will also let me know how well the smaller 30 size actually works for me. Plus, I like the idea of getting the GP for a pop of color but getting the B30 in a classic color.

That makes total sense. I say go for it! You cannot go wrong with blue zanzibar.
Both of my bags are pop colors. I do find myself wanting a neutral color every now and then.
 
Judging by these pics, I definitely think b 30 would be great for you. If you find you want to go a size smaller you could add a b 25 down the line
View attachment 4033680 View attachment 4033681 View attachment 4033682 Hi! Ok, so I went back to the store and took some photos. I’ve never uploaded anything before so hopefully I am doing this right.
Here’s the GP30 in Bleu Zanzibar and a Bolide 27 (which I am thinking would be similar-ish to a B25).
I am all over the place now!! I love the GP 30 (I like the simplicity of the shape and the size and the color and the fact that I could have it NOW) but I would love it more if it was a B25. And I’m still thinking B30 in noir, togo,pwh.
But what do you all think?
 
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Both look lovely on you! But I slightly prefer the GP30! I have one in blue agate and love it! The blue pop of colour is stunning on you!

Here are some full length action shots for size comparison of my B25
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I am biased since I do not have the B30 and prefer smaller bags. I wear my 25 on my forearm and here it is placed on a thicker suede jacket sleeve (with zipper) and clic h bracelet. The handles are not as user friendly as the 30 would be, but I don’t mind taking an extra second to put it on my forearm. I actually find that I feel more secure arm carrying it since it is more snug on there [emoji13]! HTH!
Oh this is gorgeous on you!